. >> reporter: bill clinton mocked romney in las vegas monday. >> i had a different reaction to the first debate than a lot of people did. i mean, i thought wow. here is old moderate mitt. where you been, boy? i don't have that tax plan i had for the last two years. you going to believe me or your lying eyes here now, come on. but the focus now, tomorrow's vice presidential showdown >> reporter: but 69-year-old joe biden, and paul ryan, younger, with no experience in such a debate, recalling differences in the matchup. they recalled sarah palin in the 2008 prep. >> instead of it being risky that joe biden is more seasoned and paul ryan is younger, they both have strengths that they bring to this conversation. >> reporter: and paul ryan arrived in kentucky late this evening, brian, greeted by his wife and mother and an enthusiastic crowd. his opponent, vp biden, will arrive there after resting up in his own bed in delaware. >>> and peter alexander starting us off today, our political director and chief white house correspondent, chuck todd is with us from the site of tomorrow night's debat